30-01-2020 дата публикации
Номер: US20200031983A1
Принадлежит:
Polyurethane foams are made by curing a reaction mixture that contains an aromatic polyisocyanate, at least one isocyanate-reactive material having an average functionality of at least 2 and an equivalent weight of at least 200 per isocyanate-reactive group, at least one blowing agent, at least one surfactant and at least one catalyst, at least one cyclic 1,3-diketone compound and optionally least one antioxidant. Foams so produced emit low levels of both formaldehyde and acetaldehyde. 2. The method of wherein the reaction mixture is cured in the presence of the cyclic 1 claim 1 ,3-diketone compound and at least one antioxidant.4. The method of wherein the reaction mixture is further cured in the presence of at least one antioxidant.5. A method according to claim 1 , wherein the isocyanate-reactive material having an average functionality of at least 2 and an equivalent weight of at least 200 per isocyanate-reactive group contains from 2 to 4 hydroxyl groups per molecule.6. The method of wherein the aromatic polyisocyanate is MDI claim 1 , polymeric MDI claim 1 , or a derivatives of MDI and/or polymeric MDI that contains urethane claim 1 , urea claim 1 , uretonimine claim 1 , biuret claim 1 , allophonate and/or carbodiimide groups.7. The method of claim 1 , wherein the cyclic 1 claim 1 ,3-diketone compound is cyclohexane-1 claim 1 ,3 claim 1 ,5-trione claim 1 , 1 claim 1 ,3-cyclohexadione claim 1 , pyrazolidine-3 claim 1 ,5-dione claim 1 , 1 claim 1 ,2-dimethylpyrazolidine-3 claim 1 ,5-dione claim 1 , 1-methylpyrazolidine-3 claim 1 ,5-dione claim 1 , 1 claim 1 ,1-dimethyl-cyclopentan-2 claim 1 ,4-dione claim 1 , 1-ethyl-cyclohexan-2 claim 1 ,4-dione claim 1 , 1 claim 1 ,1-diethyl-cyclohexan-3 claim 1 ,5-dione claim 1 , 6-methyl-pyran-2 claim 1 ,4-dione claim 1 , 6-ethyl-pyran-2 claim 1 ,4-dione claim 1 , 6-isopropyl-pyran-2 claim 1 ,4-dione claim 1 , 6-(n)-butyl-pyran-2 claim 1 ,4-dione claim 1 , 6-isobutyl-pyran-2 claim 1 ,4-dione claim 1 , 6-pentyl-pyran-2 claim 1 ...
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